Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Castle Gap Solar Hybrid | Upton County Solar |
|---|---|---|
| Capacity | 189.9 MW | 150 MW |
| Technology | Solar Photovoltaic, Batteries | Solar Photovoltaic |
| Operator | Upton County Solar 2 LLC | RWE Clean Energy |
| Operating units | 2 | 1 |
| Latest 12-month generation | 350.0 GWh | 267.7 GWh |
| Latest complete-year capacity factor | 23.1% (2025) | 22.8% (2025) |
| National technology rank | #216 of 7,234 | #266 of 7,234 |
| Latest EIA report | 2026-06 | 2026-06 |